JPH0333866B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides drainage equipment (hereinafter simply referred to as "drainage equipment") such as drainage traps, drainage fittings, cleaning opening fittings, drainage pipe joints, or roof drains, etc. In the so-called advance construction method in which concrete is poured after being fixed in advance to a formwork (hereinafter simply referred to as "formwork"), a drainage pipe is connected to the outer periphery of the drain pipe connection part of the drainage equipment together with the drainage equipment. This invention relates to a structure for preventing spacers fixed in advance from falling off after concrete is poured in order to secure spacers.

[Conventional technology]

Conventionally, even if this type of spacer has a simple cylindrical shape, it is fixed in the slab by drying shrinkage of the concrete, so it has been common to leave the spacer as it is in the slab.

However, it is expected that the spacer may fall out of the slab due to aging or sudden impact, creating a dangerous situation for workers and the like. For this reason, the following measures have been taken to prevent spacers from falling off the slab at locations where accidents are expected.

That is, as shown in FIG. 6, by using a spacer e provided with a protrusion d on the outer periphery, the spacer e is prevented from falling off by the latching action of the protrusion d, or as shown in FIG. As shown in Figure 2, there was a method in which the spacer g was fixed to the drainage device i via the bolt h to prevent the spacer g from falling off the slab f even after the formwork j and fixing jig k were removed. .

[Problem to be solved by the invention]

However, in order to prevent the spacer from falling off, it is necessary to prepare a spacer with special measures such as those exemplified above, which is not only disadvantageous in terms of cost, but also requires that the spacer be selected and installed. It was a hassle to do the work.

The present invention provides a method for reliably preventing the spacer from falling off the slab even if it is a simple cylindrical spacer, that is, a spacer that is not provided with a means for preventing the spacer from falling off. The purpose is to provide a prevention structure.

[Means to solve the problem]

In order to solve the above problems, the present invention provides that an appropriate portion of the lower end surface of the spacer placed on the fixture is
It protrudes from the mounting surface formed on the fixing jig,
A concave portion for concrete to flow into the lower end surface is formed at the periphery of the placement surface so that concrete can flow into the lower end surface.

[Effect]

The spacer is placed on the fixing jig with an appropriate part of its lower end surface protruding from the mounting surface formed on the fixing jig, so when concrete is poured, a part of it protrudes from the mounting surface formed on the fixing jig. After solidifying, it acts to support the spacer from below so that the spacer cannot fall off.

〔Example〕

Next, embodiments of the present invention will be described based on FIGS. 1 to 5.

FIG. 1 shows the entire structure of the drainage device 15 when it is fixed to the concrete formwork 13 by the fixing jig 1.

As shown in FIGS. 2 and 3, the fixing jig 1 of this example has a fixing rod 12 erected at the center of an annular base 2. As shown in FIGS.

The fixing rod 12 has a support hole 10 formed at the intersection of ribs 9, 9 formed almost orthogonally to the inner peripheral side of the base 2, and the lower end side of the fixing rod 12 is fixed to this support hole 10. As a result, it is erected at the center of the base 2 (see Fig. 4). Further, from approximately the middle of the fixing rod 12 to the tip, the threaded portion 11
is formed.

On the other hand, a guide edge 3 for guiding a spacer 7, which will be described later, is continuously protruded along the upper surface of the base 2 over the entire circumference of the base 2.

Further, a plurality of (in this example, four locations are illustrated) protruding tabs 6 to 6 are formed at predetermined intervals on the side edge 2a on the outer peripheral side of the base 2. A nail hole 5 is formed in each ear piece 6, and a nail 14 is inserted through the nail hole 5.
The fixing jig 1 can be fixed to the concrete formwork 13 by pouring it into the concrete formwork 13.

Furthermore, a flat mounting surface 4 for mounting a spacer 7 is formed on the base 2 along the outer periphery of the guide edge 3. The spacer 7 is formed into a pipe shape with a diameter that allows it to be fitted onto the outer circumferential side of the guide edge 3, and the mounting surface 4 is thicker than the wall thickness of the spacer 7 in the ear piece 6 described above. Widely,
The other portions, that is, the area between the ear pieces 6, 6 are formed with a width smaller than the same thickness.

By forming the mounting surface 4 in this way, when the spacer is mounted on the same base, that is, when the lower end surface 7a of the spacer 7 comes into contact with the mounting surface 4, as shown in FIG. As shown, the lower end surface 7a protrudes from the mounting surface 4 between the tabs 6, 6, and a recess into which concrete can flow is formed below the protruding lower end surface 7a'.

With the fixing jig 1 formed as described above,
A drainage device 15 is fixed to the concrete formwork 13 together with the spacer 7.

Hereinafter, the procedure for fixing the drainage device 15 to the formwork 13 will be briefly explained.

As described above, the fixing jig 1 is fixed at a predetermined position on the formwork 13 with the nails 14 to 14. Thereafter, the spacer 7 is guided by the guide edge 3 and placed on the placement surface 4 of the fixing jig 1. Next, the drain device 15 is placed on the spacer 7 with its drain pipe connecting portion 16 accommodated in the spacer 7 . In this state, the fixing rod 12 passes through the center of the drainage device 15 and projects above the drainage device 15.

Next, the holding plate 17 is placed on the draining device 15 via the space ring 19 with the fixing rod 12 inserted into the insertion hole 17' formed at the center thereof. Here, the space ring 19 has a pipe shape with a diameter that allows it to be placed along the periphery of the mouth 15a of the drainage device 15, and the presser plate 17 has a diameter that allows it to be placed on the upper surface of this space ring 19, for example. It is formed into a disc shape.

After the holding plate 17 is placed in this manner, the nut 18 is screwed onto the threaded portion 11 of the fixing rod 12, and the nut 18 is tightened. By tightening this nut 18, the draining device 15 is fixed to the fixing jig 1 via the holding plate 17 and the space ring 19, and therefore, this draining device 15 is fixed to the formwork 13.

As described above, the drainage device 15 is fixed to the formwork 13 together with the spacer 7, and then concrete is poured onto the formwork 13.

After the concrete hardens, Natsu 1
8. Fixing the holding plate 17 and space ring 19 on the rod 1
2, and then the fixing jig 1 and the formwork 13 are removed below the slab 20.

This example is configured as described above, and this configuration achieves the effects described below.

A spacer 7 is placed on a fixture 1 fixed to a formwork 13. The mounting surface 4 for the spacer 7 formed on the fixing jig 1 has a width smaller than the wall thickness of the spacer 7 between the ears 6 . (Placement surface 4b). Therefore, when the spacer 7 is placed on the placement surface 4b, a part of the lower end surface 7a of the spacer 7 that comes into contact with the placement surface 4b protrudes from the placement surface 4b. A recess 8 into which concrete can flow is formed below the lower end surface 7a' of the portion.

Note that the placement surface 4a of the ear piece 6 is the spacer 7.
When the spacer 7 is placed on the mounting surface 4a, the lower end surface 7a of the spacer 7 does not protrude.

By forming the recess 8 below the spacer 7 for concrete to flow in in this way,
When concrete is placed, the concrete also flows into the recess 8 and hardens, and the spacer 7 is supported from below and is reliably prevented from falling off the slab 20.

Therefore, there is no need to provide special means for preventing the spacer 7 from falling off the slab 20, and it is possible to reliably prevent the spacer from falling off the slab 20 by using a normal spacer. can.

In addition, in the mounting surface 4 illustrated above, a mounting surface 4b having a width smaller than the wall thickness of the spacer 7 is formed between the ears 6, 6, thereby providing a concrete inflow recess 8. The location where the spacer 8 is provided is not limited to this, but the point is that the inflow recess 8 into which concrete can flow may be formed at an appropriate location below the lower end surface 7a of the spacer 7 so as to be able to support the spacer 7 from below. It is something. Therefore, although not shown, the inflow recess 8 may be formed around the entire circumference of the lower end surface 7a, and in this case, the spacer 7 is supported below over the entire circumference of the lower end surface 7a. The Rukoto.

〔Effect of the invention〕

Since the present invention is configured as described above, when concrete is poured, this concrete flows into an appropriate location below the lower end face of the spacer and solidifies, supporting the spacer below, so that the slab Even if a spacer is not provided with a special means for preventing the spacer from falling off from the slab, it is effectively prevented from falling off from the slab.

[Brief explanation of drawings]

1 to 5 relate to embodiments of the present invention,
Figure 1 is a longitudinal cross-sectional view of the drainage equipment fixed to the concrete formwork by a fixing jig, Figure 2 is a front view of the fixing jig, Figure 3 is a plan view of the fixing jig, and Figure 3 is a plan view of the fixing jig. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a sectional view taken along the line B-B in FIG. It is a diagram. 1...Fixing jig, 2...Base, 4...Placement surface,
7...Spacer, 8...Inflow recess, 13...Formwork, 15...Drainage equipment, 20...Slab.

Claims (1)

[Scope of Claims] 1. In the pre-installation construction method of the drainage equipment, in which the drainage equipment is fixed in advance to the concrete formwork via a predetermined solid jig prior to concrete casting, the drainage equipment is fixed after the concrete is poured. In order to secure a space for drain pipe connection on the outer periphery of the drain pipe connection part of the fixture, a spacer placed on the fixing jig in advance in a state that shields the drain pipe connection part falls off after the concrete is poured. The structure is such that an appropriate portion of the lower end surface of the spacer placed on the fixing jig protrudes from the mounting surface formed on the fixing jig, and concrete can flow below the protruding portion. A structure for preventing a spacer from falling off in a pre-installation method of a drainage device, wherein a concave portion for inflowing concrete with respect to the lower end surface is formed on the periphery of the placement surface.